Electrical box spacer where you can customize the height!  Height is input in mm.  2mm is pretty close to 3/32", 6.35mm is equivalent to ¼", 12.7mm is equivalent to ½".  You can print several as is and stack them or print exact to your height needs in one piece.  They will press over the standard electrical device screw (#6) snugly so they won't just fall off but can also easily be removed if needed.  Prints super fast and will cost 99 times less than the ones you buy at the hardware store!